Small improvements on the mining page UX

- INDEXING_BLOCKS_AMOUNT = 0 disable indexing, INDEXING_BLOCKS_AMOUNT = -1 indexes everything
- Show only available timespan in the mining page according to available datas
- Change default INDEXING_BLOCKS_AMOUNT to 1100

Don't use unfiltered mysql user input

Enable http cache header for mining pools (1 min)

frontend/src/app/services/storage.service.ts

@@ -7,7 +7,7 @@ import { Router, ActivatedRoute } from '@angular/router';
 export class StorageService {
   constructor(private router: Router, private route: ActivatedRoute) {
     this.setDefaultValueIfNeeded('graphWindowPreference', '2h');
-    this.setDefaultValueIfNeeded('poolsWindowPreference', '1d');
+    this.setDefaultValueIfNeeded('poolsWindowPreference', '1w');
   }
 
   setDefaultValueIfNeeded(key: string, defaultValue: string) {